Oh, and I made to myself this small Batch that allows me to use any versions:
cd "%appdata%\.ccemuredux" javaw.exe -Xmx512M -cp %appdata%\.ccemuredux\bin\jackson-core.jar;%appdata%\.ccemuredux\bin\jackson-annotations.jar;%appdata%\.ccemuredux\bin\jackson-databind.jar;%appdata%\.ccemuredux\bin\guava.jar;[b]%appdata%\.ccemuredux\bin\computercraft.jar[/b];%appdata%\.ccemuredux\bin\gdx.jar;%appdata%\.ccemuredux\bin\gdx-backend-lwjgl.jar;%appdata%\.ccemuredux\bin\gdx-platform.jar;%appdata%\.ccemuredux\bin\lwjgl.jar;%appdata%\.ccemuredux\bin\lwjgl-platform.jar;%appdata%\.ccemuredux\bin\ccemuredux.jar com.xtansia.ccemu.desktop.DesktopLauncher
Find the %appdata%\.ccemuredux\bin\computercraft.jar, place a (different named) computercraft.jar there and rename it in the Batch.